<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>

  <style>
    h1{
      /*color: #ff0000;
      color: #f00;
      color: rgb(255,0,0);*/
      color: rgba(255,0,0,0.2);
    }
    #d2{
        width: 200px;
        height: 200px;
        background-color: rgba(255, 0, 0, 0.05);
        /*设置背景图片*/
        background-image: url("../b.jpg");
        /*设置背景图片尺寸*/
        background-size: 100px 100px;
        /*禁止重复*/
        background-repeat: no-repeat;
        /*控制位置*/
        /*background-position: 50px 100px;*/
        background-position: 50% 50%;
    }
    #d1{
        width: 611px;
        height: 376px;
        background-color: #E8E8E8;
        background-image: url("http://doc.canglaoshi.org/tstore_v1/images/itemCat/study_computer_img1.png");
        /*去重复*/
        background-repeat: no-repeat;
        background-position: 90%;
        background-size: 318px 319px;

    }
  </style>

</head>
<body>

<div id="d2"></div>
<div id="d1"></div>
<h1>颜色测试</h1>

</body>
</html>